Toner Surface Additive Package for High-Speed Printing
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Solution Overview
Problem
Current toner formulations face issues with poor fusing performance, flow properties, and drum contamination, particularly in high-speed printing, leading to problems such as paper adhesion and toner hang-ups in gravity-fed cartridges.
Innovation Solution
A novel toner composition is developed, comprising resin, optional wax, and a surface additive package that includes hexamethyldisilazane (HMDS) surface-treated silica, sol-gel silica, and optional polydimethylsiloxane (PDMS) surface-treated silica, applied externally to toner particles to enhance flow and charging characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional toner formulations are used, then manufacturing is simpler, but fusing performance is poor
Solution Approach 1:
The patent applies composite materials by combining multiple silica types (HMDS surface-treated silica, sol-gel silica, and PDMS surface-treated silica) in a specific ratio within the toner formulation. This composite additive package modifies the toner particles' surface properties to enhance fusing performance while maintaining manufacturing feasibility through a systematic blending process.
2Ease of operation
If conventional toner formulations are used, then production is easier, but flow properties are poor
Solution Approach 1:
The patent utilizes parameter changes by adjusting the surface chemistry and physical properties of toner particles through the selective addition of different silica compounds. The specific combination of HMDS, sol-gel, and PDMS silicas modifies particle surface energy, morphology, and inter-particle interactions, thereby improving flow characteristics without significantly complicating the manufacturing process.
3Object-affected harmful factors
If conventional toner formulations are used, then formulation is simpler, but drum contamination increases
Solution Approach 1:
The patent employs an intermediary approach by introducing a multi-component silica additive package that acts as a mediator between the toner particles and the drum surface. The specific combination of silicas modifies the interaction between toner and drum, reducing adhesion and contamination while maintaining formulation manageability through established mixing and processing techniques.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The novel toner composition achieves improved fusing performance, flow properties, and reduced drum contamination, enabling high-quality image development with lower toner usage and optimized performance in high-speed monochrome printing.
Implementation Method 1
a surface additive at least partially coating toner particle surfaces. The surface additive comprises a mixture of a hexamethyldisilazane (HMDS) surface treated silica, a sol-gel silica that is not surface treated, and an optional polydimethylsiloxane (PDMS) surface treated silica
Implementation Method 2
heating the slurry to form aggregated particles in the slurry
Implementation Method 3
heating the aggregated particles in the slurry to coalesce the particles into toner particles
Data Source
AI summary
A toner composition with a novel surface additive package for developing images. The additive package includes sol-gel silica, a PDMS silica, an organic spacer such as PMMA and two HMDS silicas. The toner composition exhibits improved control of voltage, higher print density, lower toner amount remaining on the roll, lower toner usage, and reduced drum contamination. The toner composition also exhibits improved dry rheological properties and improved fix properties. These improved properties make this toner composition useful for higher speed printing while using less toner.